FR2929624A1 - WEAVING PROCESS FOR MAKING A HEATING TEXTILE TABLE, HEATING TEXTILE TABLE AND WEAVING MACHINE FOR CARRYING OUT SUCH A METHOD. - Google Patents

Abstract

This weaving method for producing a heating textile web on a double-ply loom (1-2) comprises the steps of: a) providing a back (108; 208) comprising filling threads (101; 201) and delimiting the inner side (100I; 200I) of the outer side (100E; 200E) of the ply (1; 2); b) incorporating embossed threads (102,103; 202) to form relief on the inner side (100I; 200I) of the web (1; 2); c) incorporating internal weft yarns (131-134; 231-234); d) incorporating outer weft yarns (135,136; 235,236). e) incorporating bonding yarns (110, 120; 210, 220) bonded to internal (131-134; 231-234) and external (135, 136; 235, 236) weft yarns; the weaving method being characterized in that it further comprises a step of: f) incorporating, in said middle portion (100; 200), conductive warp wires (105; 205) capable of emitting Joule effect heat so that said conductive warp yarns (105; 205) are bound exclusively to internal weft yarns (131-134; 231-234).

Description

WEAVING PROCESS FOR MAKING A HEATING TEXTILE TABLE, HEATED TEXTILE TABLE AND WEAVING MACHINE FOR CARRYING OUT SUCH A METHOD

The present invention relates first of all to a weaving process for producing a double-piece heating textile web. The invention also relates to a heating textile web comprising conductive warp son. Furthermore, the invention relates to a double-weaving loom for implementing such a method for the purpose of producing such a heating textile web. Heating textile web is any fabric or woven product, such as a carpet or carpet, for producing heat. FR-A-1,567,627 discloses a heating textile web and its weaving process, in which electrical conductive yarns are woven in the warp direction or in the weft direction, and then connected to an electric power supply source. low voltage via terminal conductors arranged perpendicularly to these conductive son. These conductive son can be traversed by an electric current, so as to emit heat by Joule effect, allowing the carpet to heat the room in which it is located. However, the conductor wires of the heating mat described by FR-A-1,567,627 have a substantial portion of their length covered, on the front and back sides of the carpet, by other wires. Therefore, the heat they emit, radiation or convection, is partly dissipated towards the back of the carpet, so the floor of the room. The heating of this room by the heating mat is therefore inefficient and relatively long to achieve. In addition, the conductive son may be broken by the mechanical stresses they undergo during the manufacture and / or use of the heating mat. In particular, during the weaving of such a heating mat, the conductive son undergo frequent and sometimes large bending which generate high mechanical stresses. The broken wires are no longer electrically conductive, which further degrades the heating performance of the carpet.

In addition, these conductive son can be altered or broken, when they undergo the repeated friction that engender the comb of the loom during the shots of flying. The present invention aims to overcome these disadvantages by providing a heating textile web comprising conductive warp son whose position and maintenance maximize the heating performance, while reducing their risk of rupture. The present invention also provides a method of weaving such a heating textile web and a loom for carrying out such a method for producing such a heating textile web. For this purpose, the subject of the invention is a weaving method, for producing a heating textile web comprising a median part and at least two borders located on either side of the median part, the weaving process being implemented. by means of a double-tablecloth loom and comprising steps for the middle part of each web: a) making a backrest comprising filling threads which extend in the warp direction, the backrest defining the side internally on the outer side of the web; b) incorporating, in the warp direction, embossed yarns, such as pile yarns or loop yarns, so-called dead relief yarns intended to form relief on the inner side of the sheet; c) to incorporate so-called internal weft son of the inner side of the web; d) to incorporate so-called external weft threads on the outer side of the web; e) incorporating, in the warp direction, binding yarns bound to internal weft yarns and outer weft yarns so as to maintain at least said filling yarns, the weaving method being characterized in that it further comprises a step of: f) embedding, in each layer, conductive warp wires capable of emitting heat by the Joule effect and intended to be electrically connected to a power supply source at the level of the at least one of said borders, so that said conductive warp threads are bound exclusively to internal weft threads, at the middle portion.

These steps are performed substantially concomitantly. On the other hand, the invention relates to a heating textile web having a median portion and at least two edges located on either side of the median portion, the median portion comprising at least: a file comprising threads of filling which extend in the warp direction, the backrest delimiting the inner side of the outer side of the web; embossed threads, such as pile threads or loop threads, which extend in the warp direction, so-called dead relief threads intended to form relief on the inner side of the tablecloth; - said internal weft son inserted on the inner side of the web; - said outer weft son inserted on the outer side of the web; binder yarns which extend in the warp direction and which are bonded to internal weft yarns and external weft yarns so as to maintain at least said filling yarns; and conductive warp wires capable of emitting heat by the Joule effect and intended to be electrically connected to a power supply source at at least one of said borders, characterized in that, in said middle portion, the conductive warp threads are bound exclusively to internal weft threads. In other words, a weaving method or a heating textile web according to the invention makes it possible to bind the conductive warp threads to internal weft threads and to place them essentially on the inner side of the web, while ensuring their maintained in the textile structure, so that these conductive warp son emit heat directly towards the part to be heated and they are relatively little mechanically stressed. According to other advantageous but non-obligatory features of the invention, taken in isolation or in any technically permissible combination: each conductive warp is bonded to internal weft threads so as to have unobstructed portions of the internal weft threads, said raised portions floating, on the inner side of the web, facing a predetermined number of consecutive internal weft yarns, said determined number being greater than or equal to two; said determined number of consecutive internal weft yarns is between 2 and 100, preferably between 10 and 30; two consecutive conductive string wires in the frame direction are bound to separate internal frame wires; the conductive warp yarns form, in the weft direction, at least one set in which two consecutive conductive warp threads in the weft direction are incorporated with an interstice representing between 2 and 10 teeth of a loom comb ; - The conductive warp son form, in the weft direction, at least two sets separated by a region devoid of conductive warp wire; - Conductive elements are incorporated, in the weft direction, at each edge so as to be in contact with the conductive warp son, said conductive elements being adapted to be electrically connected to a power source; - At the edges, the conductive warp son are partially exposed on the outer side of the web; the conductive elements comprise conductive strips; at the edges, each conductive warp yarn is bonded to outer weft yarns, the conductive warp yarns floating on the outer side of the web at at least two consecutive outer weft yarns; the conductive elements comprise conductive weft wires and the conductive wire leads are connected to the conductive weft wires; at least one of the borders is composed of an inner fabric and an outer fabric, the inner fabric being disposed generally opposite and independently of the outer fabric, the outer fabric being formed by the son of conductive chains and conductive weft; - The conductive elements are covered by means of a reverse formed by the end of the corresponding edge; the dead relief threads follow the same armor as the filling threads; all or part of the conductive warp wires have an elastic core covered by a conductive wire; and the heating textile web results from the separation by means of at least one knife of a double ply made by a weaving process as explained above. Furthermore, the subject of the invention is a double-weaving loom for implementing a weaving method as described above so as to produce a heating textile web as explained above, this loom weaving having at least two weft insertion levels.

The invention will be well understood and its advantages will also emerge in the light of the description which follows, given solely by way of nonlimiting example and with reference to the appended drawings in which: FIG. 1 is a sectional view, parallel to the warp direction, a portion of a double carpet according to the invention during their weaving according to a method according to the invention; - Figure 2 is a sectional view, parallel to the chain direction and on a smaller scale than Figure 1, a portion forming the edge of a textile web from the double carpet of Figure 1; - Figure 3 is a view similar to Figure 2 of an alternative to the textile web of Figure 2; and FIG. 4 is a diagrammatic view, from the back and on a smaller scale, of the assembly of the textile ply partially shown in FIG. 3; FIG. 1 illustrates a double carpet D, during its weaving according to a method according to the invention and by means of a loom, not shown. but according to the invention. Such a loom has two levels of weft insertion. The double carpet D is composed of two parts, namely an upper heating mat 1 and a lower heating mat 2, which are separated, after their weaving, by means of a knife 12.

The belt 1 is equipped with a back 108 which delimits the internal 1001 and external 100E sides of the carpet 1. The outer side 100E comprises the back of the carpet 1, which is intended to be in contact with the ground or any other support. The inner side 1001 comprises the face of the belt 1, which is intended to be turned towards the volume to be heated. The backrest 108 comprises filler wires 101 which extend in the chain direction symbolized by the axis C-C '. The dead pile threads 102, that is, the pile threads that do not form a pattern, follow the same weave as the filling threads 101. The dead pile threads 102 are intended to form pile threads. 103 of the drawing 103 in relief on the internal side 1001 of the carpet 1. Such son of drawing bristles 103 extend generally in a direction perpendicular to the direction C-C '.

Alternatively to the son 102 and 103, a carpet according to the invention may comprise other son embossed, such as loop son, dead loop son being intended to form buckles in relief on the front side of the carpet. Furthermore, Figure 1 shows reliefs formed by a single drawing thread 103. However, these reliefs may be formed by several son of successive or simultaneous relief. The belt 1 further comprises conductive warp wires 105 which are intended to be electrically connected to a power supply source, such as the source 481 in FIG. 4. In the context of the present invention, the terms conductive and conductive relate to the property of electrical conduction, that is to say that they mean electrical conductor or electroconductive. Similarly, the terms insulating and insulating refer to the property of electrical insulation. Thus, when the source 481 delivers an electric current, the conductive warp son 105 are traversed by electric currents and they dissipate these currents in the form of heat by Joule effect, which allows for example to heat the volume of a room. The conductive warp yarns 105 are incorporated so as to extend in the chain direction C-C 'and, for most of their length, on the inner side 1001 of the carpet 100, as shown in FIG. This arrangement allows the conductive warp wires 105 to emit the heat they produce directly to the volume of the workpiece to be heated. More specifically, this arrangement facilitates the radiation and convection of heat to the room to be heated, limiting the amount of son that can form an obstacle to this radiation or convection.

The belt 1 furthermore comprises so-called external weft yarns 135 and 136 which are inserted on the outer side 100E and so-called internal weft yarns 131, 132, 133 and 134 which are inserted on the inner side 1001. The belt 1 also comprises first binding yarns 110 and second binding yarns 120 which extend in the chain direction C-C '. In order to maintain the filling threads 101 and the dead pile threads 102, the first 110 and the second 120 binding threads are bonded to the internal weft threads 131 to 134 and the external weft threads 135 and 136. By related to, we hear that partially surround. Specifically, the first binding yarns 110 are bonded to first internal weft yarns 132 and 134 as well as to first external weft yarns 136, while the second binding yarns 120 are bonded to second internal weft yarns. 131 and 133 and second outer weft yarns 135. Thus, following the chain direction C-C ', the binding yarns 110 and 120 are bound to every other yarn among the internal weft yarns 131 to 134 and then to one out of every two threads of the outer weft threads 135 and 136 adjacent. Since the internal weft yarns 131 to 134 and the outer weft yarns 135 and 136 frame the backrest 108, i.e., the filling yarns 101, the binding yarns 110 and 120 are alternately bonded to internal weft yarns 131 to 134 and external weft son 135 and 136, through the back 108. The binding son 110 and 120 thus ensure the maintenance of the filling son 101 and son of dead hair 102. In the example of the figures, the carpets 1 and 2 are woven in a two-revolution weave, that is, a drawing pile thread 103 is formed in two revolutions of the loom. Thus, the drawing pile threads 103 are alternately wound around an outer weft thread 135 or 136 of the carpet 1 and a corresponding outer weft thread 235 or 236 of the carpet 2. The pile threads 103 allow forming a relief pattern on the respective faces 1001 or 2001 of the mats 1 or 2. On the other hand, the conductive warp threads 105 are bonded to some internal weft threads 134, but not to the other internal weft threads 131 to 133 and to the outer weft yarns 135 to 136. Specifically, two internal weft yarns 134 to which the conductive warp threads 105 are consecutively bonded are separated, in the warp direction C-C ', by a predetermined number three occurrences of consecutive internal weft yarns 131 to 133 which are disengaged from the conductive warp yarns 105. Thus, each conductive warp yarn 105 is bonded exclusively to internal weft yarns and has portions 105A disengaged from the warp yarns.frame, internal 131 to 133 and external 135 to 136. Each unbleached portion 105A of a conductive warp wire 105 floats on the inner side 1001 at at least two, in this case three internal weft son 131, 132 and 133 consecutive. In other words, each internal weft wire 131, 132 or 133 at which the free portion 105A floats is disposed between the back 108 and the unblocked portion 105A. In practice, this determined number can be between two and one hundred. Consequently, each conductive warp wire floats mainly on the front side of the mat, which makes it possible to emit the heat essentially towards the volume to be heated.

In the example of Figure 1, the conductive warp threads 105 are bonded to internal weft threads 134, all four internal weft insertions, so that they float for 75% of their length on the inner side 1001 and that they are never placed on the outer side 100E. In practice, the conductive warp threads 105 can float over two to one hundred threads of consecutive internal frames, or about 1 centimeter of carpet length, preferably from ten to thirty internal weft threads. Alternatively, the conductive warp yarns can float on a plurality of consecutive internal warp yarns and then follow the weave of the fill yarns onto a plurality of other consecutive internal weft yarns.

Therefore, during a weaving process according to the invention, the conductive warp threads 105 are relatively often moved from the internal position, or medium, to the outer shed position and vice versa, as compared to the weaving methods. of the prior art. In fact, they are moved only at each pick where they are connected to an internal weft yarn 134. Such a weaving process reduces the mechanical stresses on each conductive warp thread 105, thus its risk of breaking during weaving. 1. On a loom according to the invention, the pile threads 102 and 103 are controlled by a three-position Jacquard mechanism, while the filling threads 101 and the binding threads 110 and 120 are mounted on the smooth frames set in motion, for example, by means of a dobby. The conductive warp yarns 105 can be supplied at the creel or by a beam and are carried by slats mounted on frames controlled by a dobby and separate frames carrying filler son 101 and binding son 110 and 120 The middle part 100 of the belt 1 illustrated in FIG. 1 constitutes the major part of the belt 1 in the chain direction C-C '. In the medial portion 100, the conductive warp threads 105 are bound exclusively to internal weft threads 134, so that they are always placed on the inner side 1001 and not on the outer side 100E of the middle portion 100 of the mat 1. Thus, the drawing appearing on the back is not degraded by the presence of conductive warp threads 105, since these are hidden by the backrest 108. On the inner side 1001, to allow the son of drawing hair 103 to camouflage the warp threads With floating conductors 105, the diameter of the conductive warp threads 105 is selected sufficiently small relative to the height of the bristles formed by the drawing bristles 103 after separation of the two woven carpets 1 and 2 simultaneously. The warp threads that follow the same weave as the filling threads 101 on several insertions of internal frames 131 to 134 consecutive or on several insertion of external frames 135, 136 consecutive are considered to include the folder 108 of the carpet 1 at these levels. picks, so that they are arranged neither internal nor external side at the level of these picks. The description of the carpet 1 given above in connection with FIG. 1 can be directly transposed to the carpet 2 which is similar to it. Elements of the belt 2 which are identical or corresponding to those of the belt 1 have the same numerical references increased by 100. The middle part 200, the filling threads 201, the dead pile threads 202, the backrest 208, the outer side are thus defined. 200E, the inner side 2001, the conductive warp yarns 205, the unblocked portions 205A, the first tie yarns 210, the second tie yarns 220, the inner weft yarns 231 to 234, and the outer weft yarns 235 and 236. 2 illustrates an individual carpet 1 after its separation from the carpet 2 by means of the knife 12, while FIG. 1 illustrates the middle portion 100 of the carpet 1 still associated with the carpet 2. FIG. carpet 1 continuously woven with the middle part 100, on the loom double piece. Thus, each conductive warp wire 105 is continuous along the length of the heating mat 1 and thus effectively conducts the electric current. The length of the border 150 is small, in the direction C-C ', in front of the length of the middle portion of the carpet 1. A not shown border, similar to the border 150, is located at the other end, in the direction C-C 'chain, the middle portion 100 of the carpet 1. Thus, in Figure 2, the drawing pile son 103 have raised free ends facing the inner side 1001 at the middle portion 100. The edge 150 is distinguished from the middle part 100 of the carpet 1 by its absence of drawing bristles 103 and by different armors for the warp threads compared to those of the middle part 100. Thus, the edge 150 has a different thickness than that of the middle portion 100 of the carpet 1. The edge 150 is here composed of two globally independent fabrics, namely a so-called internal fabric 1511 and a so-called external 151E tissue which join in a single fabric 151T, at the opposite end to the middle part 100. The internal 1511 and external 151E tissues are woven simultaneously, so that they are arranged opposite one another. The so-called internal fabric 1511 corresponds to the face side of the carpet 1, that is to say that it is intended to be turned towards the volume to be heated by the carpet 1. The so-called external fabric 151E corresponds to the back side of the carpet 1 that is, it is intended to rest on the floor or other support. In the inner fabric 1511, the filling threads 101 and the first binding threads 110 are connected to weft threads 152 of the same type as those used in the middle part 100 following inverted cloth weaves, that is to say that the filling thread 101 passes over a weft thread 152, while the binding thread 110 passes below the same weft thread 152 and vice versa. This ensures the maintenance of the internal fabric 1511. Back side, the outer fabric 151E includes conductive weft threads 156, in this case five in number and symbolized with hatching. The conductive warp yarns 105 are bonded to the conductive weft yarns 156 in plain weave, i.e., the conductive warp yarn 105 passes alternately above and below the successive weft yarns 156 and it is then partially exposed on the back side. In addition, the second binding yarns 120 are bound exclusively to the conductive weft yarns 156, in inverted web weave relative to that of the conductive warp yarns 105. In other words, each conductive weft yarn 156 is sandwiched between a second binding yarn 120 and a conductive warp yarn 105. Thus, the conductive warp yarns 105 and the conductive weft yarns 156 are held in sharp electrical contact, so that the current delivered by a connected power source the conductive threads 156 can flow from one to the other. The conductive weft yarns 156 thus form conductive elements, embedded in the weft direction at each type edge 150, so as to connect the conductive warp wires 105 in parallel with a power source.

The conductive warp yarns 105 and the conductive weft yarns 156 may be made of yarns having different structures and dimensions. According to a variant shown in Figures 3 and 4, the conductive elements incorporated in the frame direction TT 'comprise conductive strips 457 and 467A and 467B respectively for a high edge 450 and a low edge 460 of a heating mat 4. The strips Conductors 457, 467A and 467B extend, on the back side, in the frame direction symbolized by the axis T-T '. As shown in FIG. 3, at the borders 450 and 460, the conductive warp wires 405 are no longer bonded to internal frame wires 452 but bonded to external weft wires 451A, type 135 and 136, so that the conductive wires 405 are partially exposed on the back side of the belt 4. More specifically, the conductive warp wires 405 have, between two external weft wires 451A to which they are connected, portions which float on the back side at the level of minus two consecutive external frame wires 451B. The conductive strips 457, 467A and 467B are then secured to the belt 4, at the borders 450 and 460, on the back side of the belt 4, after weaving and separation of the two parts, by any known means, so as to be in electrical contact with the lead wires 405. Such an arrangement makes it possible to ensure an extended surface electrical contact with the conductive warp wires 405. The conductive elements formed by the conductive weft wires 156 or the conductive strips 457, 467A and 467B and their contacts with the conductive warp threads 105 or 405 may be protected by a cuff formed by a corresponding fabric portion forming the rim 150, 450 or 460. In the example of Figure 2 this setback may be formed by the tissue 151T extending at the end opposite the middle portion 100, the fabrics 1511 and 151E. Such a fabric 151T may for example be formed by the filling son 101 that follow the conductive warp son 105 and the son of dead hairs 102, these son being held by binding son linked to internal and external frames. At the end of the weaving process and after the connection of the conductive wires 105 to the conductive elements 156, the back of the carpet 1 may be coated with an adhesive, in a manner known per se, so as to protect the whole of the electrical contacts. In addition, this adhesive and / or the backrest 108 thermally isolates the ground conductive warp son 105, which limits the heat loss. As shown in Fig. 4, the conductive warp wires 405 form, in the weft direction T-T ', two sets 405A and 405B separated by a region 407 without conducting wire. The region 407 makes it possible to avoid inadvertent electrical contact, that is to say any short circuit between the sets 405A and 405B respectively connected to each pole of a source 481 of power supply. In the variant of FIG. 2, this result can be achieved by cutting, at the region devoid of conducting wire, the conductive weft wires 156 of one of the two edges of type 150. The contact strips or the conductive weft son are continuous at each set 405A and 405B. In order to ensure the safety of the user, the power source 481 is a low voltage power source, typically less than 42V. In addition, the separation into two halves of one of the conductive elements arranged in the T-T 'frame direction, band or son, makes it possible to bring the connection points of the carpet closer to the terminals of the source 481, which reduces the The length of the source connection wires 481. Furthermore, as shown in FIG. 4, the conductive warp wires 405 are distributed generally uniformly in the frame direction TT 'in the two sets 405A and 405B. In each set 405A or 405B, two consecutive lead wires 405 in the weft direction T-T 'may be incorporated into the fabric 4 with a gap representing between two and ten teeth of a comb of a loom. Thus, two consecutive lead wires 405 in the weft direction T-T 'can not come into mutual contact because they are separated by non-conductive warp threads such as binding yarns or filling threads. According to a variant not shown, the conductive warp son can be connected in parallel so as to form a single set of conductive warp son, in which the distribution of conductive warp son in the weft direction is of the same type as that described for the 405A or 405B assembly. Such a mat further comprises conductive elements located on either side of the mat and a connecting wire, to a power source of type 481, which can extend typically along a lateral edge of the mat , in the warp direction. Such a carpet thus has a regular distribution of conductive warp son in the weft direction, which allows to evenly heat the volume to be heated. On the other hand, two consecutive lead wires 105 or 405 in the T-T 'frame direction may be bonded to separate internal weft wires. This makes it possible to distribute the heat produced in the volume to be heated very evenly. For this, the conductive warp son are controlled individually, by means of a Jacquard mechanism or set up on separate frames with different movements. In the T-T 'frame direction, the resistivity and the amount of the conductive warp wires are selected according to the desired heating power for the heating mat. Likewise, the frame conducting elements are dimensioned in number, resistivity and diameter, depending on the electrical power to be supplied to the conductive warp wires. In all cases, the conductive warp son are selected so that their heating is compatible with the temperature resistance of the non-conductive son that make up the carpet. The structure and dimensions of the type 105 or 405 conductive warp yarns may also be selected to withstand the relatively low mechanical stresses to which they are subjected during the manufacture and use of the heating mat 100. In particular, their elongation at break is preferably between 10% and 15%, in order to limit or even avoid the risk of breakage of a conductive warp when it follows the planned armor. Likewise, the elongation at break of the type 156 conductive weft yarns is preferably about 5%, because the weft yarns are mechanically less stressed than the warp yarns. For this, all or part of the conductive son 105 or 405 or 156 have an elastic core guiped, that is to say, covered by winding, by a wire. This structure can itself be covered by an insulating wire. EP-A-1,537,264 provides an example of such a composite yarn. Such a yarn offers mechanical and electrical properties adapted to its incorporation during weaving in a heating mat according to the invention. Alternatively, it is possible to use conductive wires 105 or 405 or 156 having an elastic core covered by a conductive wire itself protected by an insulating sheath. In both cases, the insulating protection, sheath or wire, preferably provided for the conductive warp threads 105 or 405, protects them from the alterations caused by the repeated friction with the comb during the shots. The insulating protection may be removed before or after weaving at the contact areas provided with the conductive elements. For example, depending on the dimensions of the heating mat to be produced, the wire can be produced without insulating protection over the parts of its length that correspond to the contact areas. The invention has been described here in connection with a heating mat, nevertheless it can be implemented to achieve other types of heated woven textile webs, for example a heated carpet.

Claims (18)

REVENDICATIONS1. A weaving method for producing a heating textile web having a medial portion (100; 200; 400) and at least two edges (150; 250; 450; 460) located on either side of the medial portion (100; 200; 400), the weaving process being carried out by means of a double-ply loom and comprising steps for the middle part of each ply (1; 2; 4): a) to make a folder ( 108; 208) comprising filling threads (101; 201) which extend in the chain direction (C-C '), the back (108; 208) delimiting the inner side (1001; 2001) of the outer side ( 100E; 200E) of the web (1; 2; 4); b) incorporating, in the warp direction (C-C '), embossed threads (102, 103, 202), such as pile threads or loop threads, so-called dead relief threads (102; 202) being intended to form relief on the inner side (1001; 2001) of the web (1; 2; 4); c) incorporating so-called internal weft yarns (131-134; 231-234) from the inner side (1001; 2001) of the web (1; 2; 4); d) incorporating so-called external weft yarns (135, 136; 235, 236) on the outer (100E; 200E) side of the web (1; 2; 4); e) incorporating, in the warp direction (C-C '), binding threads (110, 120; 210, 220; 410, 420) bound to internal weft threads (131-134; 231-234); and external weft yarns (135, 136; 235, 236) for holding at least said fill yarns (101; 201), the weaving method being characterized by further comprising a step consisting of: f) incorporating, in each layer (1; 2; 4), conductive warp wires (105; 205; 405) capable of emitting heat by the Joule effect and intended to be electrically connected to a source of power; power supply (481) at at least one of said edges (150; 250; 450; 460), such that said conductive warp wires (105; 205; 405) are bound exclusively to internal weft wires ( 131-134; 231-234) at the middle portion (100; 200; 400). 2. Heating textile sheet (1; 2; 4) having a medial portion (100; 200; 400) and at least two edges (150; 250; 450; 460) located on either side of the central portion (100; 200, 400), the middle part (100; 200; 400) comprising at least: - a backrest (108; 208) comprising filling threads (101; 201) which extend in the warp direction (C-; C '), the back (108; 208) delimiting the inner side (1001; 2001) of the outer side (100E; 200E) of the web (1; 2; 4); embossed threads (102, 103, 202), such as pile threads or loop threads, which extend in the warp direction (C-C '), so-called dead relief threads (102; 202) being intended to form relief on the inner side (1001; 2001) of the web (1; 2; 4); - so-called internal weft son (131-134; 231-234) inserted on the inner side (1001; 2001) of the ply (1; 2; 4); - so-called external weft son (135, 136; 235, 236) inserted on the outer side (100E; 200E) of the web (1; 2; 4); binder yarns (110, 120; 210, 220; 410, 420) which extend in the warp direction (C-C ') and are bonded to internal weft yarns (131-134; 234) and external weft threads (135, 136; 235, 236) to maintain at least said fill threads (101; 201); and conductive warp leads (105; 205; 405) capable of emitting Joule heat and intended to be electrically connected to a power source (481) at at least one of said edges ( 150; 250; 450; 460), characterized in that in said middle portion (100; 200; 400) the conductive warp threads (105; 205; 405) are bound exclusively to internal weft threads (131- 134; 231-234). 3. Textile heating cloth (1; 2; 4) according to claim 2, characterized in that each conductor wire (105; 205; 405) is bonded to internal weft wires (131-134; 231-234) so as to have unobstructed portions (105A). internal weft yarns (131-134; 231-234), said floating portions (105A) floating on the inner side (1001; 2001) of the web (1; 2; 4) facing a predetermined number of weft yarns; consecutive internals (131-133; 131-233), said determined number being greater than or equal to two. 4. Heating textile sheet (1; 2; 4) according to claim 3, characterized in that said determined number of consecutive internal weft yarns (131-133; 231-233) is between 2 and 100, preferably between 10 and and 30. 5. Textile heating cloth (1; 2; 4) according to claim 3 or 4, characterized in that two consecutive conductor string wires (105; 205; 405) in the weft direction (T-T ') are connected to internal weft wires (131-134; 231-234) separate. Heated textile web (1; 2; 4) according to one of claims 2 to 5, characterized in that the conductive warp threads (405) form in the weft direction (T-T ') at least one set (405A, 405B), wherein two consecutive conductive warp threads (405) in the weft direction (T-T ') are incorporated with an interstice of between 2 and 10 teeth of a loom comb. Heating textile web (4) according to claim 6, characterized in that the conductive warp threads (405) form at least two sets (405A, 405B) separated by a region (407) devoid of conductive warp (405). Heating textile tablecloth (1; 4) according to one of Claims 2 to 7, characterized in that conductive elements (156; 457, 467A, 467B) are incorporated in the frame direction (T-T '), at each edge (150, 450, 460) so as to be in contact with the conductive warp wires (105; 405), said conductive elements (156; 457, 467A, 467B) being electrically connectable to a power source; power supply (481). Heating textile tablecloth (1; 4) according to claim 8, characterized in that at the edges (150; 450; 460) the conductive warp threads (105; 405) are partially exposed on the outer side (100E). ) of the web (1; 4). 10. Textile heating cloth (4) according to one of claims 8 to 9, characterized in that the conductive elements comprise conductive strips (457, 467A, 467B). A heating textile web (4) according to claim 10, characterized in that at each of the edges (150; 450; 460) each conductive warp yarn (405) is bonded to external weft yarns (451A). the conductive warp yarns (405) floating on the outer side (100E; 200E) of the web (4) at at least two consecutive outer weft yarns (451B). Heating textile tablecloth (1) according to one of claims 8 to 9, characterized in that the conductive elements comprise conductive weft wires (156) and in that the conductive wires (105) are connected to the wires. conductive frame (156). 13. Textile heating cloth (1) according to claim 12, characterized in that at least one of the borders (150) is composed of an inner fabric (1511) and an outer fabric (151E), the fabric internally (1511) being disposed generally opposite and independent of the outer tissue (151E), the outer fabric (151E) being formed by the conductive string son (105) and conductive threads (156). 14. Heating textile sheet (1; 4) according to one of claims 8 to 13, characterized in that the conductive elements (156; 457, 467A, 467B) are covered by means of a reverse formed by the end of the corresponding border (150, 450, 460). 15. Textile heating cloth (1; 2; 4) according to one of claims 2 to 14, characterized in that the dead relief son (102; 202) follow the same armor as the filling son (101; 201) . 16. Textile heating cloth (1; 2; 4) according to one of claims 2 to 15, characterized in that all or part of the conductive warp threads (105; 205; 405) have an elastic core covered by a conductive thread. . 17. Heating textile sheet (1; 2; 4) according to one of claims 2 to 16, characterized in that it results from the separation by means of at least one knife (12) of a double layer (D ) performed by a weaving method according to claim 1. 18. Double weaving loom for implementing a weaving method according to claim 1 so as to produce a heating textile web (1; 2; 4) according to one of claims 2 to 17, the weaving loom comprising at least two levels of frame insertion.